In z2 mode the INT bit in $4800 is set. In z3 mode it is not set. In both cases this is before i have initialized the rr device.

So to me it seems that in z3 mode, somehow this bit is set before any software is run. Basicly what Jens said i guess..

Please send me what you got.. Fun to look at.

Oki. I will put resourced driver to Zone tomorrow, if Jens or Chris will be not angry. If this is only INT bit problem for Z3, then this bit can be set in driver (software fix for hardware bug?). The best if you have access to Amiga with Z3 and no nak timeout problem. Then you can check if this bit is 0 or 1 for working Amiga Z3 config.